Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1994-03-18
1995-09-26
Hjerpe, Richard
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
345200, G09G 114
Patent
active
054537630
ABSTRACT:
A still picture display apparatus comprises a VRAM and a character ROM. The VRAM is allocated first coordinate addresses corresponding to display positions of a raster scan type display, and a character code representing a character to be displayed is stored in each of the first coordinate addresses. The character ROM is divided into a plurality of storage areas, and dot data of the character is stored in an address designated by the above character code in each of the storage areas. An extended RAM is also allocated second coordinate addresses similarly to the VRAM, and modifying data (character modifying data and/or color modifying data) corresponding to the character code stored in the VRAM is stored in each of the second coordinate addresses. The modifying data is read out of the extended RAM and is loaded into a register and then, is applied as a higher order address of the character ROM to designate any one of the storage areas, and the character code read out of the VRAM is applied as a lower order address of the character ROM. Consequently, the dot data of the character corresponding to the character code is read out of the character ROM.
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Nakagawa Katsuya
Tanaka Hideki
Yamato Satoshi
Hjerpe Richard
Nintendo Co. Ltd.
Wu Xiao M.
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